"The Three Boxes of Life and How to Get Out of Them" is a book published in 1981 by Richard N. Bolles that reminds us all that we don't have to be trapped by the notion that our lives have to proceed in the order of school, work, and retirement (and then, of course, death).
One way to avoid being trapped is to take a "sabbatical" from your career and go back to school for a while. Obviously, for many reasons, this is not always possible or practical.
Another probably more attainable way is to find a way to make your current career more fulfilling and by continuing to make inter-generational connections.
"All of us have creative potential, even if it's not the power to produce great music, scientific discoveries, or literature. Our lifetime of experience can give us unique abilities to contribute to the lives of others, as long as we maintain our mental flexibility and avoid getting set in our ways. We can also inspire others by our own personal narratives, the stories of our lives. By showing others that you refuse to be defined or limited by your age, and by sharing your wisdom with the younger generation, you will become an Age Buster. We can all avail ourselves of opportunities to feel we are making a difference, no matter what our age (Susan Krauss Whitbourne, Ph.D.)."
Now that's some good stuff!